H750 series is with single module two sim cards
 A1) work with one sim card.
 A2) work with two sim card. Two sim card backup each other (cold standby for failure backup).
 Five working mode:
 1) SIM1 only
 2) SIM2 only
 3) SIM1 preferred
 4) SIM2 preferred
 5) AUTO (backup each other)
 Two sims can be any type from 2G/3G/4G at GPRS/EDGE/HSDPA/HSUPA/HSPA/HSPA+/LTE/CDMA1x/CDMA2000 EVDO. (Please confirm the type before order)
Main:
 Built-in 2G/3G/4G industrial cellular module, insert SIM/UIM card to work directly;
 Built-in two sim card slots;
 RJ45 LAN *3;
Option feature:
 1. WiFi
 2. GPS
 3. Serial to cellular gateway (RS232 or RS485 port)
 4. video server (connect with camera)
 5. WAN RJ45 port
 6. Internal battery
 7. MIMO Cellular diversity receiving (with this feature, router can get better signal and speed)
Redundancy backup: cellular1+ cellular 2+ WAN RJ45

>> Protocol
Protocol support:
 TCP, UDP, SMTP, POP, ICMP, FTP, PPP, PPPoE, DHCP, DDNS, DNS, WPS, DMZ, S og, NAT, xDSL, NTP, QoS, SNMP, RIP, support firmware update locally or remotely.

>> Security
support 64/128 bits WEP, 802.1x, WPA, and WPA2
 support WDS
 support WPA1/2  PSK
 support WPA1/2  802.1x
 support EAP TLS, TTLS, LEAP, PEAP
 TKIP, AES encryption
 support access with user name & password.
 support access control base WAN/LAN interface
 support access control base source IP address
 defense DOS attack, support SYN flooding, IP surfing, ping of Death, fragile, teardrop, land etc.
 support PAP & CHAP
 support IP filtering 
Advanced Firewall Features:
 Network Address Translation (NAT)
 Stateful Packet Inspection (SPI)
 VPN Pass-through
Media Access Control: CSMA/CA with ACK
Certifications: REDIUS Client